.c{
    width: 1200px;
    margin: auto;
}
html,body{
    margin: 0;
    padding: 0;
    font-family: Arial;
    font-size: 14px;
}
:root{
    --ct:#567bea;
    --ch:#ff7b14;
}
a{
    text-decoration: none;
}
.head{
    height: 60px;
    background: var(--ct);
    border-bottom: 1px solid rgba(239, 239, 239, 0.2);
    color: #e9e9e9;
    .title{
        font-size: 24px;
        font-weight: bold;
    }
    .nv{
        font-size: 16px;
        padding: 0 30px;
        cursor: pointer;
        transition: color .2s;
        color: #e9e9e9;
        &:hover{
            color: var(--ch);
        }
    }
}
.topXC{
    height: 600px;
    background: var(--ct);
    font-family: Arial 宋体;
    h3{
        font-size: 38px;
        color: #ffffff;
        font-weight: normal;
        letter-spacing: 10px;
        margin:180px 0 30px;
    }
    p{
        color: rgba(255, 255, 255, 0.9);
        font-size: 18px;
        letter-spacing: 2px;
    }
    .download{
        padding: 15px 30px;
        color: #fff;
        border: 1px solid rgba(255, 255, 255, 0.8);
        margin: 40px 8px 0;
        cursor: pointer;
        display: block;
        letter-spacing: 2px;
        transition: all .3s;
        &:hover{
            background: #fff;
            color: #567bea;
        }
    }
}
.tutorial{
    .hed{
        font-size: 26px;
        text-align: center;
        margin: 60px 0 40px;
    }
    .title{
        font-size: 22px;

    }
    .img{
        text-align: center;
    }
    p{
        margin: 15px 0;
        font-size: 18px;
    }
}
.with{
    p{
        line-height: 30px;
        color: #666666;
    }
    span{
        display: block;
    }
}
.case{
    .lv{
        width: 320px;
        height: 280px;
        border: 1px solid #eeeeee;
        cursor: pointer;
        margin: 0 15px;
        a{
            display: block;
            padding: 20px 0;
            color: #fff;
            font-weight: bold;
            font-size: 20px;
            text-align: center;
            background: #567bea;
        }
        p{
            padding: 15px;
        }
        span{
            display: inline;
            background: #f3ca73;
            color: #ffffff;
            margin: 0 2px;
        }
        transition:  box-shadow .3s;
        &:hover{
            box-shadow: 0 0 30px #e8e8e8;
        }
    }
}
footer{
    text-align: center;
    line-height: 24px;
    color: #666;
    margin-top: 60px;
    .c{
        padding: 60px 0 40px;
        border-top: 1px solid #efefef;
    }
}
.gotop{
    position: fixed;
    display: block;
    width: 40px;
    height: 40px;
    border-radius: 20px;
    background: #567bea;
    color: #ffffff;
    bottom: 15%;
    right: 80px;
    text-align: center;
    line-height: 40px;
    cursor: pointer;
}
.header{
    position: fixed;
    left: 0;
    top: 0;
    width: 100%;
}
.logs{
    width: 800px;
    border: 1px solid #cbcbcb;
    padding: 30px;
    margin: auto;
}
.codes{
    &.top60{
        margin-top: 60px;
    }
    .title{
        text-align: center;
        padding: 60px 40px;
        font-size: 28px;
    }
}